These are some suggested improvements to BDFiddle:

• The terms "Automatic" and "Manual" displayed in BDFiddle are confusing and doesn't convey the meaning properly. I think "Basic" and "Advanced" are more common in terms of usage.
• The text about file size limit "(<5M)" doesn't look like descriptive enough. Maybe "(maximum size of 5 MB)" is better? Also update to 50 MB.
• Does it make sense to disable buttons (or may be sections itself) that shouldn't be clicked at a particular stage of operation? For example, while a user in Step 1, buttons in Step 2 and 3 does not need to be active.
• BD Tools CAtalog URL needs to be changed to https://browndog.ncsa.illinois.edu/toolscatalog/. Currently, it's browndog.ncsa.illinois.edu/tools
• Users are able to click and choose the "steps" at the top of the page. If it doesn't serve any functionality, they should be left unclickable.